Cable-line attachment for drilling machines



July 1, 1930. J. REYNARD CABLE LINE ATTACHMENT FOR DRILLING MACHINES Filed July 18, 1928 PatentedJ uly -l, 1930 JONAH REYNARD, F TIFFIN', OHIO, ASSIGNOR- TO THE LOOMIS .MACHINE COMPANY,

.OF TIFFIN, OHIO, A CORPORATION OF OHIO CABLE-LINE ATTACHMENT For; DRILLING MACHINES Application filed July 18, 1928. 7 Serial No. 293,657.

This invention relates to a cable line attachment for drilling machines and especially to the mounting of the crown pulley, which is located at the upper end of the der- ,5 rick and over which the drill cable is trained.

In carrying on drilling operations, the succession of shocks and strains" incident to the reciprocation of the drilling tool gradually loosens or distorts the connections of the derrick or tower, and throws a back lash on the machine.

With such conditions in mind, it is the object of the present invention to provide an improved mounting for the crown pulley which will permit the pulley to yield slightly, as the-movement of the cable is reversed, until the inertia of the drilling tool and cable is overcome. Another object of the invention is to arrange a number of yieldable elements in such a manner that a part of them may be removed to lessen the resistance when a lighter tool is used. These yieidable elements are all housed in'such a manner that in case some of them should break, there is no danger of anything falling on the workmen beneath. I 7

The specific construction of this yieldable mounting and its relation to the upper end of the derrickbeam will be more particularly I as explained with reference to the accompanying drawings, which illustrate the same i its preferred form.

In the drawings 2- I Figure 1 is a front elevation of the upper portion of a derrick beam, with the invention embodied therein. i

Fig. 2 is a side elevation thereof.

F ig. 3 is a section taken on the line 88 ofFig.2.

As shown in the drawings, the invention is associated with the upper end of a derrick beam having two rails 5 disposed in spaced parallel relation with a spacing block 6 between them and secured by means of bolts 7. A pulley 8 is rotatably mounted on a spindle 9 which extends into slots 10 formed in the upper ends of the rails and is slidable vertioally therein. Keepers ll'are secured to the rails for guiding the cable as it passes about L the pulley 8.

The spindle 9 is securedin the arms of a U- shaped yoke 12 which is slidably mounted between the upper ends of the rails 5 and is guided between straps 13 which are secured to the rails and project inwardly from the edges thereof. The yoke 12 rests on a block 14: which is also slidable vertically betweentlie rails 5. V

The upper end of-the block 6 constitutes a seat on which the block 1 1 is supported by means of a plurality of coil springs. There may be one or more pairs ofthese springs, each comprising an outercomparatively'stiif spring 15 and an inner spring 16 which is weaker than the spring 15. In case several pairs of springs are used, they may be separated by spacers 17. Cleats 18 are 'removably secured to the rails 5 and in conjunction there with constitute a housing for the springs 15 and 16. i "A pulley 19 is usually mountedat the side of the spudding beam for supporting a sand line. Studs 20 are secured to the rails 5vfor connecting other parts of the derrick. s In the 'operation'of the drill cable, when a sudden pressure is imposed on thepulley 8, the springs 15 and l6'gradually take up the sho'clg' allowing-tlie pulley to yield downwardly. Thus the inertia of the cable line is gradually-overcome as the drill is raised, andsudden strains'on the derrick connections are effectually prevented. 1 ""When operating with 'a comparatively heavy, drilling tool and long length of cable, all'of the springs will be used. When operating with a lighter tool or shorter length of cable, the inside springs 15 may be removed," and insome instances one or two of the springs 16 may be removed, and blocks sub- I stituted therefor, in order to get the proper amount of resilience to absorb the shocks.

While I have shown and described in considerable detail the preferred construction-of the invention, it is obvious that the same may be considerably modified without any material departure from the salient features thereef as claimed. 1

What I claim is: 1. In a drilling machine, the combination with a derrick beam having spaced parallel 10 rails formed with slots in their upper ends,

of a pulley having an axial spindle slidable in said slots, a yoke guided for longitudinal movement between said rails and supporting 7 said spindle, a seat beneath said yoke, resilient means between said seat and said yoke, urging the latter upwardly, and cleats secured to and connecting said rails and cooperating therewith to form a housing for said resilient means, said'resilient means including a plurality of coil springs arranged in pairs, one spring of each pair being inside the other, and one or more of saidsprings being removable to adjust the amount of resiliency to the weight of the tool and cable used. v v

2. In a drilling machine, a derrick beam comprising spaced'parallel rails formed with longitudinal slots at their upper ends, a spacing block between said rails below said slots and constituting a seat, means for securing said rails against opposite faces of said block, cleats secured to said rails above said seat and cooperating therewithrto form a reotangular housing, resilient cushioning means resting on said seat within the housing, an upper block resting on said cushioning means, a yoke resting on said upper block and guided in said housing, and a pulley having an axial spindle journaled in said yoke and guided for movement up and down in said slots.

3. In adrilling machine, a derrick beam comprising spaced parallel rails formed with longitudinal slots at their upper ends, a

spacing block between said rails below said slots and constituting a seat, means for se curing said rails against opposite faces of said block, cleats secured to said rails above said seat and cooperating therewith to form a rectangularhousing, .pairs of coil springs arranged end to end and guided within the 7 housing with the lowermost pair resting on said seat, one spring of each pair being in- I side the other, an upper block resting on the uppermost pair of springs, a yoke resting on said upper block and guided in said housing, and a pulley provided with an-axial spindle journaled in :said yoke, and guided for movement up and down in said slots. 7 In testimony whereof I have hereunto signed my name tothis specification,

J ONAH REYNARD. 

